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3 years ago

A.liver e.mouth i.stomach

Chemistry

1 answer:

viktelen [127]3 years ago

8 0

Answer:

8. c

9. e

10. k

11. L

12. d

13. j

14. h

15. g

16. a

17. F

18. b

19. i

Explanation:

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Why is light helpful? You can just give one reason

hoa [83]

Light is helpful because it allows us to see things around us.
I hope this helps :)

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3 years ago

Place the following substances in order of increasing vapor pressure at a given temperature.

Butoxors [25]

Answer:

NH3 < NF3 < BCl3

Explanation:

The vapour pressure of a substance has something to do with the nature of intermolecular forces between its molecules. If the molecules of a substance are held together by strong intermolecular forces, the substance will display a low vapour pressure at a given temperature and vice versa.

Ammonia has the lowest vapour pressure because of strong intermolecular hydrogen bonds that hold its molecules together.

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3 years ago

Two bulbs are connected by a stopcock. The large bulb, with a volume of 6.00 L, contains nitric oxide at a pressure of 0.700 atm

ivolga24 [154]

Answer:

$O_{2}$ and $NO_{2}$

Explanation:

For a given system at constant temperature, the number of moles of gas present in the system is proportional to the product of the system pressure and volume. Therefore, we have:

NO: 6 L * 0.7 atm = 4.2 L*atm

O: 1.5 L* 2.5 atm = 3.75 L*atm

For the given system based on a balanced chemical equation:

2.70 L*atm of nitric oxide reacts with (2.7/2) 1.35 L*atm of oxygen. This shows that there is more oxygen gas in the system than nitric oxide. Thus nitric oxide is the limiting reactant.

At the end of the experiment:

All the nitirc oxide has been used up, i.e. $P_{NO}$ = 0

For the product: 2.70 L*atm NO produced 2.70 L*atm $NO_{2}$

The total volume of the system after the stopcock is opened = 6+1.5 = 7.5 L

The partial pressure of $NO_{2}$ = (2.70 L*atm $NO_{2}$ ) / (7.5 L) = 0.36 atm $NO_{2}$

Similarly for oxygen gas:

3.75 L*atm - 1.35 L*atm = 2.40 L*atm oxygen gas remaining

Partial pressure of oxygen is:

2.40 L*atm / 7.5 L = 0.32 atm

Thus, the gases present at the end of the experiment are $O_{2}$ and $NO_{2}$

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3 years ago

Hydrogen and nitrogen react to form ammonia. Which statement best

madam [21]

<h2>Hydrogen and nitrogen react to form ammonia. The statement that best </h2><h2>describes the reactants and product at equilibrium: (A)The concentration of hydrogen and nitrogen equals the ammonia </h2><h2>concentration</h2>

Explanation:

Reversible reaction

The reaction that can occur in either way that is the reactants can also form products and the same time products can combine to form reactants back.

That is :

A +B--> C+D

At the same time this reaction also occurs :

C+D-->A +B

In reversible reactions the stage is reached , where concentration of reactants become equal to concentration of products .That stage is called "Equilibrium state ".

In the above asked question : Formation of ammonia is a reversible reaction and in this also equilibrium is achieved where concentration of reactants and products become equal but reaction doesn't stop .

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3 years ago

Resonance structures have _______ connectivity of atoms and _______ distribution of electrons.

Gnoma [55]

Answer:

same, different

Explanation:

Resonance structures have _same______ connectivity of atoms and __different_____ distribution of electrons.

Resonance structures are obtained in molecules where the atomic positions are the same but the electrons joining the atoms keep on delocalising. Usually, none of the resonating structures can fit the molecule or ion. This implies that the real structure is the hybrid of all the possible structures.

5 0

3 years ago

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